Bump essentia from 2.1b5 to 2.1b6.dev1177

Bumps [essentia](https://github.com/MTG/essentia) from 2.1b5 to 2.1b6.dev1177.
- [Release notes](https://github.com/MTG/essentia/releases)
- [Changelog](https://github.com/MTG/essentia/blob/master/Changelog)
- [Commits](https://github.com/MTG/essentia/commits)

---
updated-dependencies:
- dependency-name: essentia
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

setup.cfg

@@ -37,7 +37,7 @@ python_requires = >=3.4
 
 [options.extras_require]
 madmom = madmom
-essentia = essentia==2.1b5
+essentia = essentia==2.1b6.dev1177
 
 [options.packages.find]
 exclude =